1965AggieMustang

Okay, we've got the motor in the car (the motor mounts were transposed by the way, and the inch gap disappeared when we switched them) and we're ALMOST there. We're cranking, we're getting spark, but for some reason the mechanical fuel pump isn't getting fuel to the carburetor. When we pull it out and manually pump it, the fuel flows, but when we mount in on the block, and crank the motor, nada. Any suggestions? Is it possible that we're mounting it incorrectly? Anybody have a similar problem?

Thanks in advance!

Travis

Starfury

It's possible the front cam bolt loosened up, allowing the fuel pump eccentric to flop around. Gotta pull the timing cover to fix that=/

1965AggieMustang

We just got the motor back from the machine shop for a complete rebuild. I can't imagine something has loosened up since the motor hasn't been started yet. Is it possible they forgot to put something in?

cdeck714

could have they put a new cam in that doesn't have a lobe for the mechanical pump?

kalli

yah. that's another idea. II'd call the shop who rebuilt it and ask them.
Tell em you have a mechanical fuel pump that is not operated.
See what they have to say about that. If you have a electrical pump from a difference car you can use in the meantime work away but you have to regulate the pressure.
You don't want to throw more than 7psi of fuel towards a carb
My guess is as well no or bad camlobe as well. maybe they have other suggestions. i'd call

cdeck714

that's what happened with my brother's mopar. rebuilt the 440 with different cams. ended up there was no lobe for the mechanical pump and had to put on an electric fuel pump.

Starfury

There is no cam lobe on a sbf for the pump. The fuel pump eccentric is bolted to the front of the cam. I suspect they didn't install one, didn't torque it down tight enough, or they used the wrong dowell pin in the end of the cam which would let the eccentric float.

Derf00

Put a little bit of white grease on the Fuel Pump arm, install it, crank it. Pull the pump off and see if the grease has been disturbed. If it hasn't, there's no eccentric or it's too far from teh arm to reach it. Are you using any type of plasic spacer on the fuel pump mount? (Phenolic spacer)

67mustang302

You can tell if there's an eccentric when you install the pump. You SHOULD have to angle the pump arm downward to get it under the eccentric, and then manhandle it a bit to get the bolt holes to line up. If not, then the eccentric is either loose or not there.

Stepman

^^^ Yeah, what he said.